Well obviously the works produced by a typewriter aren't speech because the works are produced not by a person but a mechanical contraption.

And let's not start with a blog post or website comment. Those aren't speech because they aren't even written by human hands they are instead just using a very fancy elctro-mechanical mechanism for transferring a series of electric waves from one individual to another across the palent.

A typewriter is a function. You press a key and you get one and only one result right? 1 to 1

AI generatively creates different output every time.